Tracking of Direct and Reflected Global Navigation Satellite System (GNSS) Signals in Hubble Servicing Mission 4

B. W. Ashman, J. L. Garrison

Abstract:	Multipath is a significant source of Global Navigation Satellite System (GNSS) error for spacecraft operations in the proximity of large structures. Understanding the nature of this multipath is important for space rendezvous and docking. Extensive work has previously been done to model the error effects on a chaser spacecraft GNSS receiver. However, a more detailed study of the raw signal behavior itself could enable new multipath mitigation techniques, or the incorporation of reflected signal rays into the navigation solution. Until recently, such raw GNSS signal collections during space operations have not been available. This paper presents the results of strong- and weak-signal tracking of raw GNSS data collected during Hubble Servicing Mission 4 (HSM4). The signal tracking is described, and the reflected signal power, code phase and geometry are analyzed with respect to direct signals in order to distinguish Hubble reflections from those due to the immediate receiver environment on the Space Shuttle.
Published in:	Proceedings of the ION 2013 Pacific PNT Meeting April 23 - 25, 2013 Marriott Waikiki Beach Resort & Spa Honolulu, Hawaii
Pages:	1117 - 1124
Cite this article:	Ashman, B. W., Garrison, J. L., "Tracking of Direct and Reflected Global Navigation Satellite System (GNSS) Signals in Hubble Servicing Mission 4," Proceedings of the ION 2013 Pacific PNT Meeting, Honolulu, Hawaii, April 2013, pp. 1117-1124.
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